Production of ice colors



Patented Oct. 29, 1929 UNITED STATES PATENT OFFICE WILHELM CHRIST, OFOFFENZBACH-ON-THE-MAIN, GERMANY, ASSIGNOR TO GENERAL ANILINE WORKS, IN0., OF NEW YORK, N. Y., A CORPORATION OF DELAWARE PRODUCTION OF ICECOLORS 1T0 brewing. Application filed November 19, 1925, Serial No.70,186, and in Germany December 1, 19%

The present invention relates to-the production of the so-calledice-colors.

The production of ice-colors by means of those azo components whichpossess a defi- 5 nite substantive character is generally carried out badding a cotton mass with a solution- 0 t e proper azo component, de-

- hydrating as far as possible by squeezing,

pressing, suction, or'centrifuging, and then,

without drying, developing, while still moist,

by means of a diazo compound. Even when dehydrated as completely aspossible, the

fiber always mechanically retains a not inconsiderable amount of thepadding liquor.

18 Particularly in packed material and warpbeams the spaces between thematerial hold considerable quantities of the padding liquor whoseremoval is desired in the production of unobjectionable colors, which isparticularly 20 important in the use of azo components having only weaksubstantive properties.

This invention is based on an improvement in the production ofice-colors by means of azo components whose character allows thedevelopment of the padded articles in moist condition, which consists inremoving the paddingsolution held by the material after padding ordehydration, by treatment with a rinsing solution whi h contains. anelectrolyte as an essential co ponent. By the expression electrolyte asused herein is to be understood not only a salt, but also a caustic sodasolution. p

The rinsing li uid may consist of a more or less weak pad ing solutionto which caustic soda solution and a salt have been added,

or in case the azo component used has a ionounced substantive character,of mere y a' solution of a salt, which in certain circumstances ispartly replaced with some caustic soda, or merely of a dilute causticsoda solution. B subsequent development there are produce which cannotbe obtained without the removal of the padding solution not fixed on thefiber, so that the dyer working with less care can obtainunobjectionable colors with certain use, for example, in the productionof ice colors much faster to rubbing colors by means of the arylids orarylendiimines of 2.3-hydroxynaphthoic acid (see U. S. Patent No.1,099,108), or by the use of acetoacetyl or diacetoacetyl compounds ofamino bases, as described in British Patents Nos. 211,772 and 211,814,as well as in all cases in which there is used an azo component whosesubstantive character allows the degeopment of the padded article inmoist con- A. further important advantage of the here-' indescribedprocess lies in the fact that in this way, by the treatment withalkaline wash solutions, it is possible toiremedy any possible injuriesproduced from the padding material on the fiber due to the action of theair during centrifuging, suction, or continued standing, which possiblyleads to the formation of streaky or weak colors. Since furthercentrlfuging or suction is unnecessary, and as a result the air cannotfurther come into play, there is obtained in this way colors whollydevoid of objection.

In using the described method of procedure, it is no longer necessary toadd formaldehyde to the padding solution, for example, of 2.3hydroxynaphthoic acid arylids, by means of which the padded articles arenormally protected from the influenceof the air, in so far as theprocess is carried out in the hereinabove described manner followin thedeh dration step, and the color develope immediately thereafter. If,however, the mentioned solutions are used for washing before thecentrifuging or suction operation, or if it is necessary to allow themass to stand for some time before the development of the color, it isbest to work in such a way that padding is carried out with a addingsolutio containin no addition of ormaldehyde, an to add t evformaldehyde to the mentioned displacing solution. In this way there "isobtained in the simplest manner a (padding bath free from formaldehyde,an which therefore possesses an unweakened permanency, while on theother hand the padded yarns are rendered securely stable in the air.

The new process is useful in all processe for the production of colorsdeveloped on the jectionable and good colors fast to rubbing areobtained in all cases. I Ewample 1 30 kg. of yarn are padded in a bathwith a solution containing 7 gr. of 2.3-hydroxynaphthoic acid anilid,caustic soda solution, and 7 c. c. of formaldehyde to the liter. Theyarn is centrifuged and washed in the bath with a solution containing0.5 gr. of 2.3-hydroxynaphthoic acid anilid, and further containingbesides the amount of canstic soda necessary to keep it in solution 10.c. c. of caustic soda solution of.34 B. and 30 gr. of common salt perliter. After thewashing, the washing solution is allowed to ,drain, andthen the yarn is developed in the usual way. E Z6 2 wamp A warpbeam ofkg. ispadded in anopen or closed dyeing apparatus with a solutioncontaining 2 gr. of 2.3-hydroxynaphthoic aeid-beta-naphthalid andcaustic soda per liter, pressed out with compressed air, and

rinsed with a bath containing 40 gr. of com- 'mon salt and 10 c. c. ofcaustic soda solution of 34 B. (per liter. After rinsing it is againdehydrate by pressing and developed in the usual way.

Example 3 100 kg. of cross reels are padded in mapparatus according tothe pack system, with a solution contaimng 1.5 gr. of bis-2.3-hy--Example 4 50 kg. of cotton yarn are padded in 1000 liters of a solutioncontaining 2 gr.

of 2.3-hydroxynaphthoylaminohydrochinondimethylether per liter andcaustic soda. The

I padding bath is free from formaldehyde.

After padding it is allowed to drain and the padded article is placed ina rinsing bath containing 50. gr. of common salt, 10 c. c. of causticsoda solution of 34 B6. and 2 c. c of formaldehyde per liter, removedafter the rinsing centrifuged and developed in the usual way.

In the following claims the term rinsingliquid is intended to compriseonly suc aqueous liquids as contain the padding constltuent, if at all,only in concentrations substantially less than the concentration ofpadding constituent in the liquid contained in the goods coming from thepadding solution.

I claim:

1. In processes of producing ice colorson electrolyt 2. In processes ofproducing ice colors on textile materials from azo components, thecharacter of which allows the development of the padded material inmoist con ition, the step comprising treating the padded material with arinsing liquid containing a caustic alkali.

3 In processes of producing ice colors on textile'materials from azocomponents, the character of which allows the develo ment of the paddedmaterial in moist con ition, the step comprising treating the paddedmaterial with a rinsing liquid containing a caustic alkali and an alkalimetalsalt.

4. In processes of producing ice colors on textijle materials from azocomponents, the character of which allows the develo ment of the paddedmaterial in moist con ition, the step comprising treating the paddedmaterial with a rinsing liquid containing a caustic alkali, an alkalimetal salt and formaldehyde.

5. In processes of producing ice colors on textile materials from azocomponents, the character of which allows the develo ment of the paddedmaterial in moist con ition, the step comprising treating the padded ma;terial with a rinsing liquid containing a nonacidic electrolyte and-thepadding solution in a concentration substantially less than that of theoriginal padding liquor.

6. In processes of producing ice colors on textile materials the stepcomprising treating the textile material, padded with a2-3-hydroxynaphthoic acid arylid compound, with a rinsing liquidcontaining a non-acidic electrolyte.

7. In processes of producing ice colors on textile materials the stepcomprisin treating the textile material, padded wit a 2-3hydroxynaphthoic acid arylid compound, with a rinsing liquid containinga caustic alkali.

8. In processes of producing ice colors on textile materials the stepcomprising treating the textile material, padded with a 2-3-.hydroxy-naphthoic acid arylid compound,

hydroxynaphthoio acid arylid compound, with a rinsmg liquid containinga. non-acidic electrolyte and the padding solution in a. concentrationsubstantially less than that of the original padding liquor. v

- In testimony whereof, I aflix my signature.-

Dlt WILHELM CHRIST.

